//引入axios异步请求插件
import axios from 'axios'

let cancel, promiseArr = {}

const CancelToken = axios.CancelToken;

// 添加请求拦截器
axios.interceptors.request.use(function (config) {

    // 发起请求时，取消掉当前正在进行的相同请求
    if (promiseArr[config.url]) {
        promiseArr[config.url]('操作取消')
        promiseArr[config.url] = cancel
    }
    else {
        promiseArr[config.url] = cancel
    }

    // 在发送请求之前做些什么
    return config;
}, function (error) {
    // 对请求错误做些什么
    return Promise.reject(error);
});


// 添加响应拦截器
axios.interceptors.response.use(function (response) {
    // 对响应数据做点什么
    return response.data;
}, function (err) {
    if (err && err.response) {
        switch (err.response.status) {
            case 400:
                err.message = '错误请求'
                break;
            case 401:
                err.message = '未授权，请重新登录'
                break;
            case 403:
                err.message = '拒绝访问'
                break;
            case 404:
                err.message = '请求错误,未找到该资源'
                break;
            case 405:
                err.message = '请求方法未允许'
                break;
            case 408:
                err.message = '请求超时'
                break;
            case 500:
                err.message = '服务器端出错'
                break;
            case 501:
                err.message = '网络未实现'
                break;
            case 502:
                err.message = '网络错误'
                break;
            case 503:
                err.message = '服务不可用'
                break;
            case 504:
                err.message = '网络超时'
                break;
            case 505:
                err.message = 'http版本不支持该请求'
                break;
            default:
                err.message = `连接错误${err.response.status}`
        }
    } else {
        err.message = "连接到服务器失败"
    }
    // 对响应错误做点什么
    return Promise.reject(err);
});


// 全局的 axios 默认值 请求的默认前缀 只要是发出去请求就会 默认带上这个前缀
axios.defaults.baseURL = '/shop';

//设置默认请求头 异步的
axios.defaults.headers = {
    'X-Requested-With': 'XMLHttpRequest'
}

// 设置超时请求时间
axios.defaults.timeout = 10000;

//get请求
let GET = (data = {}) => {
    if(data.params.prefix != undefined){
        console.log(data.params.prefix)
        axios.defaults.baseURL = '/chat';
    }

    return new Promise((resolve, reject) => {
        axios({
            method: 'GET',
            url: data.url,
            params: data.params,
            cancelToken: new CancelToken(c => {
                cancel = c
            })
        }).then(function (res) {
            resolve(res)
        })

        axios.defaults.baseURL = '/shop'
    })
}

// POST请求
let POST = (data = {}) => {
    return new Promise((resolve, reject) => {
        axios({
            method: 'POST',
            url: data.url,
            data: data.params,
            cancelToken: new CancelToken(c => {
                cancel = c
            })
        }).then(function (res) {
            resolve(res)
        })
    })
}

// 文件上传请求
let UPLOAD = (data = {}) => {
    //封装表单数据对象
    var RequestData = new FormData()

    if (JSON.stringify(data.params) != "{}") {
        for (var key in data.params) {
            RequestData.append(key, data.params[key])
        }
    }

    return new Promise((resolve, reject) => {
        axios({
            method: 'post',
            url: data.url,
            data: RequestData,
            headers: { 'Content-Type': 'multipart/form-data' },
            cancelToken: new CancelToken(c => {
                cancel = c
            })
        }).then(res => {
            resolve(res)
        })
    })
}

export {
    GET,
    POST,
    UPLOAD
}